I decided to use fetchmail because I have a multiuser (my family :). Linux and fetchmail delivers mail to the smtp port where qmail takes over.

Installation was no problem, multidrop works with the following .fetchmailrc :

poll PersonalMail.Germany.EU.net
protocol pop3
username myname
password mypassword
# the next two lines do the trick for multidrop
localdomains mydomain.de
is * here
# T2 of the fetchmail FAQ states that qmail needs this
forcecr